What Could Currently Cause Cramps And Pink, Smelly Discharge When Discontinuing Birth Control Pills Lead To Black Spotting For Three Months?

Hi I was taking a birth control, I stopped taking it sometime around November. I then began to see black blood sports on my liner for like three months then it stopped. Few days ago I felt cramps and I thought I was gonna go on my days, it s been three days now the only thing that I see a pink like smelly discharge. I ve been abstaining for 6 months now, what could be the problem